You can use apps like SeedGrow WhatsApp Chat, Extendons WhatsApp Integration, or WhatsApp Buddy to add a chat button with ease no coding required. These apps support features like custom buttons, multiple agents, and pre-filled messages.
For advanced features like automated order updates, use the WhatsApp Business API with services like Interakt or Chat Mitra.
Alternatively, you can manually add a WhatsApp button by inserting a link into your theme code. This allows customers to chat with you directly, improving support and engagement.